Assumption for Writables that should be documented somewhere: * Each type must have a 0 argument constructor. * Each call to write must not assume any shared state. * Each call to readFields must consume exactly the number of bytes produced by write.
SequenceFile also assumes: * All keys are exactly the same type (not polymorphic). * All values are exactly the same type. * Both types are specified by the writer in the create call. -- Owen
